I love this scene. Dean was holding it together until this moment and all the stress and the worry finally gets to him. Just the way he takes a minutes to breathe and just let it out and the way he just talks himself to calming down; It’s amazing. The thing is, at this point, he didn’t even know Sam was ‘dead’. Great acting. Great scene.
Jensen did a lot of great acting in this ep, and the other actors too.